An efficient approach to achieve the shielding effectiveness (SE) by using a frequency-selective surface (FSS) is presented. This FSS, which consists of cross dipoles and rings printed on the opposite sides of a single-layer FR-4 substrate, exhibits a wide, 7.5-GHz stopband to provide simultaneous shielding in both X- and Ka-bands. Experimental results confirm SE of the prototype over an ultra-wide band with more than 20-dB measured attenuation. The design is compact and suitable to provide shielding against the radiation interference caused by license-free and other radio systems.

A Single-Layer Frequency-Selective Surface for Ultrawideband Electromagnetic Shielding

Autonomous vehicle (AV) technology can provide a safe and convenient transportation solution for the public, but the complex and various environments in the real world make it difficult to operate safely and reliably. A connected autonomous vehicle (CAV) is an AV with vehicle connectivity capability, which enhances the situational awareness of the AV and enables the cooperation between AVs. Hence, CAV technology can enhance the capabilities and robustness of AV to be a promising transportation solution in the future. This paper introduces a representative architecture of CAVs and surveys the latest research advances, methods, and algorithms for sensing, perception, planning, and control of CAVs. It reviews the state-of-the-art and state-of-the-practice (when applicable) of a multi-layer Perception-Planning-Control architecture including on-board sensors and vehicular communications, the methods of sensor fusion and localization and mapping in the perception layer, the algorithms of decision making and trajectory planning in the planning layer, and the control strategies of trajectory tracking in the control layer. Furthermore, the implementations and impact of vehicle connectivity and the corresponding consequential challenges of cooperative perception, complex connected decision making, and multi-vehicle controls are summarized and their significant research issues enumerated. Most importantly, the critical review in this paper provides a list and discussion of the remaining challenges and unsolved problems of CAVs in each Section which would be helpful to researchers in the field. The comprehensive coverage of this paper makes it particularly useful to academic researchers, practitioners, and students alike.

Research Advances and Challenges of Autonomous and Connected Ground Vehicles

This letter presents the design of a dual-band wearable fractal-based monopole patch antenna integrated with an electromagnetic band-gap (EBG) structure. The prototype covers the GSM-1800 MHz and ISM-2.45 GHz bands. The EBG structure reduces the radiation into the human body over 15 dB. It also reduces the effect of frequency detuning due to the human body. The performance of the antenna under bending, crumpling, and on-body conditions has been studied and presented. Specific absorption rate (SAR) assessment has also been performed to validate the antenna for its usefulness in wearable applications.

Dual-Band EBG Integrated Monopole Antenna Deploying Fractal Geometry for Wearable Applications

Progress in frequency selective surface-based smart electromagnetic structures: A critical review

Globally, breast cancer is a major reason for female mortality. Due to the limitations of current clinical imaging, the researchers are encouraged to explore alternative and complementary tools to available techniques to detect the breast tumor in an earlier stage. This article outlines a new, portable, and low-cost microwave imaging (MWI) system using an iterative enhancing technique for breast imaging. A compact side slotted tapered slot antenna is designed for microwave imaging. The radiating fins of tapered slot antenna are modified by etching nine rectangular side slots. The irregular slots on the radiating fins enhance the electrical length as well as produce strong directive radiation due to the suppression of induced surface currents that radiate vertically at the outer edges of the radiating arms with end-fire direction. It has remarkable effects on efficiency and gain. With the addition of slots, the side-lobe levels are reduced, the gain of the main-lobe is increased and corrects the squint effects simultaneously, thus improving the characteristics of the radiation. For experimental validation, a heterogeneous breast phantom was developed that contains dielectric properties identical to real breast tissues with the inclusion of tumors. An alternative PC controlled and microcontroller-based mechanical MWI system is designed and developed to collect the antenna scattering signal. The radiated backscattered signals from the targeted area of the human body are analyzed to reveal the changes in dielectric properties in tissues. The dielectric constants of tumorous cells are higher than that of normal tissues due to their higher water content. The remarkable deviation of the scattered field is processed by using newly proposed Iteratively Corrected Delay and Sum (IC-DAS) algorithm and the reconstruction of the image of the phantom interior is done. The developed UWB (Ultra-Wideband) antenna based MWI has been able to perform the detection of tumorous cells in breast phantom that can pave the way to saving lives.

/pdf/a-low-cost-and-portable-microwave-imaging-system-for-breast-4tdguxwfma.pdf

A Low Cost and Portable Microwave Imaging System for Breast Tumor Detection Using UWB Directional Antenna array

Design of a Compact Double-Square-Ring-Shaped Dual-Band Antenna for WiMAX/WLAN Applications

Nowadays, with the technological improvement, communications with the things become easier. It helps people to live an easier life, live and work smarter as well as take back control of their lives completely. this smart communication is done in an environment that called Internet of Things (IoT) environment. The Internet of Thing is multiple physical objects that communicate using the internet, allowing sending, and receiving of data. Since it’s a data so it's prone to attack in a goal of steal it, change it and so many reasons.  In addition, nowadays hackers are everywhere with so many types.  So, it needs to protect those data and the devices, if Internet of Things devices doesn't have enough security to protect the system from being compromised, then many threats and attacks will occur. If the administrator does not apply strong security and develop a plan for system and device prevention, the Internet of Things environment will be weak, which will make the system and devices prone to attack. Unauthorized access will be prevented if the login system includes a signature matching system. This research aims to analyze the traffic security and analyze threats and risks using IoT devices from intruders by applying an IDS to the IoT environment. when the attacker will try to enter to the traffic or send any packets to any IoT devices, the intrusion detection system will send an alert to the administrator that there's something wrong need to check, the IDS will detect the attacker's name, type and from which device he tries to enter to the system, it will analyze the traffic system, as well as will prevent the devices and data from threats.

/pdf/intrusion-detection-system-to-advance-iot-security-2tmaiibv.pdf

Rajesh Natarajan

Papers

Design of a Compact Double-Square-Ring-Shaped Dual-Band Antenna for WiMAX/WLAN Applications

Intrusion detection system to advance IoT security environment